1. (a) No person shall produce, supply, or use nonpotable water from an OTNWS that does not have an engineering report which has been approved by the local jurisdiction.
2. (b) The engineering report must be prepared by a professional engineer licensed in California and who has a minimum of three (3) years' experience in wastewater treatment.

3. (c) The engineering report must contain the following information:

   1. (1) An identification of the responsible entity and all other entities that will be involved in the construction, commissioning, and ongoing operation and maintenance of the OTNWS, including a description of any legal arrangements outlining roles and responsibilities associated with each entity and proof of filing of property covenants for district-scale projects pursuant to section 60604(b);
   2. (2) A description of the untreated alternate water source(s) proposed for treatment by the OTNWS, method and manner of collection, location of collection and/or storage facilities, and estimated proportion of water sources to be treated by the OTNWS if multiple untreated alternate water sources are collected for treatment;

   3. (3) Description, and if available, any documentation of the collection, storage, and distribution system(s) components, which includes the following information:

      1. (A) Plans and specifications;
      2. (B) Existing and proposed piping systems;
      3. (C) Pipe locations of nonpotable and potable systems;
      4. (D) Type and locations of the outlets and plumbing fixtures;
      5. (E) Type, size, and material of storage tanks; and
      6. (F) The backflow prevention assemblies to prevent backflow of onsite treated nonpotable water into the public water systems and municipal recycled water systems;

   4. (4) A description of the OTNWS treatment train, which includes the following information:

      1. (A) A complete schematic of the treatment train, including how it connects to the collection, storage, and distribution system;
      2. (B) A description of how the treatment train will meet the pathogen log reduction target in Table 60630-1, either by compliance with section 60632 or section 60634; and
      3. (C) A description of each treatment process, including design and operational parameters;

   5. (5) A description of how the SCADA system performs all of the following:

      1. (A) Identifies, acquires, and uses monitoring data to inform operators, generate reports, and take autonomous actions;
      2. (B) Identifies, alerts, and responds to a failure of a control point to meet a critical limit and halts or diverts the flow of inadequately treated water; and
      3. (C) Identifies the log reduction value performance status of each treatment process for which a log reduction has been credited and uses that status to determine the treatment train's ability to meet the pathogen log reduction targets pursuant to section 60630;
   6. (6) A description of each supplemental water supply, which includes the following information: source(s), quality, anticipated capacity available, cross-connection control(s), and backflow prevention measure(s);
   7. (7) A description of planned monitoring and reporting, which includes the method and frequency of calibration for any continuous monitoring instrument;
   8. (8) A description of how the project proponent will comply with design requirements in Article 6 of this Chapter;

   9. (9) A description of contingency planning designed to prevent inadequately treated water from being delivered to the users that includes the following:

      1. (A) A list of conditions which would require an immediate diversion to take place;
      2. (B) A description of the diversion or disposal facilities and capacity; and
      3. (C) A list of local jurisdiction contacts to notify of any treatment failures that could result in the delivery of inadequately-treated onsite treated nonpotable water to the use area;

   10. (10) A description of the use area that includes the following information:

       1. (A) Type of occupancy;
       2. (B) Type of use;
       3. (C) Method for application or use of onsite treated nonpotable water;
       4. (D) Availability of onsite treated nonpotable water and, if applicable, scheduled application time and duration of water application;
       5. (E) Public access, hours of operation, and maximum occupancy;
       6. (F) Use area containment measures and use area requirements;
       7. (G) A map and description of locations of signage, along with types of signage installed, meeting the requirements of section 60692; and
       8. (H) Design or construction drawings showing all piping networks within the use area including onsite treated nonpotable water, sewage, drinking water, and any other piping as applicable.
   11. (11) A description of staffing for the full operation and maintenance of the entirety of the OTNWS facilities;
   12. (12) A description of means for compliance with cross-connection control requirements in Article 9 of this Chapter;
   13. (13) A validation study report prepared in accordance with section 60682, if required;
   14. (14) A commissioning plan prepared in accordance with section 60684;
   15. (15) Other report elements specified by the local jurisdiction to evaluate the effectiveness of the proposed OTNWS; and
   16. (16) Other report elements specified by the sewer service provider to prevent significant adverse impacts to community sewer system from operation of the OTNWS.

Note: Authority cited: Sections 13558 and 13558.1, Water Code; and Sections 116271 and 116350, Health and Safety Code. Reference: Sections 13558 and 13558.1, Water Code.

History

1. New article 7 (sections 60680-60688) and section filed 4-22-2026; operative 4-22-2026 pursuant to Water Code section 13558(f) (Register 2026, No. 17).